Kaspiysk is a city located in the Republic of Dagestan, Russia. Situated on the coast of the Caspian Sea, it lies approximately 18 kilometers (11 miles) southeast of the regional capital, Makhachkala.
The city serves as a working-class satellite city to Makhachkala. According to the 2010 Russian census, Kaspiysk was ranked as the fourth-largest city in Dagestan.